US6791813B2 - Communication line surge protecting system - Google Patents

Communication line surge protecting system Download PDF

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Publication number
US6791813B2
US6791813B2 US10/226,313 US22631302A US6791813B2 US 6791813 B2 US6791813 B2 US 6791813B2 US 22631302 A US22631302 A US 22631302A US 6791813 B2 US6791813 B2 US 6791813B2
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US
United States
Prior art keywords
conductor line
line
external conductor
wavelength
communication
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Expired - Lifetime, expires
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US10/226,313
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English (en)
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US20030043524A1 (en
Inventor
Takashi Shikano
Kiyotaka Ando
Chikashi Okabayashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Docomo Inc
Sankosha Corp
Original Assignee
NTT Docomo Kyushu Inc
Sankosha Corp
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Application filed by NTT Docomo Kyushu Inc, Sankosha Corp filed Critical NTT Docomo Kyushu Inc
Assigned to SANKOSHA CORPORATION, NTT DOCOMO KYUSHU, INC. reassignment SANKOSHA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ANDO, KIYOTAKA, OKABAYASHI, CHIKASHI, SHIKANO, TAKASHI
Publication of US20030043524A1 publication Critical patent/US20030043524A1/en
Application granted granted Critical
Publication of US6791813B2 publication Critical patent/US6791813B2/en
Assigned to NTT DOCOMO, INC. reassignment NTT DOCOMO, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NTT DOCOMO KYUSHU, INC.
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/202—Coaxial filters

Definitions

  • the present invention relates to a communication line surge protecting system that protects a communication line, communication equipment, or the like from lighting surge and the like induced in the communication line.
  • a lighting arrester such as a gas tube arrester is disposed between an outer circumference of a central conductor of a coaxial connector and an inner circumference of an external conductor.
  • lighting surge and the like induced in the communication line are discharged and grounded by the lighting arrester to protect the communication line, connection equipment, or the like from lighting surge and the like.
  • the lighting arrester is connected between the outer circumference of the central conductor of the coaxial line and the inner circumference of the external conductor, a capacity is added to this portion to disadvantageously increase losses to the communication line, thereby narrowing a frequency band.
  • a quarter wavelength open circuit for a wavelength used is disposed in each of a central conductor line 1 and an external conductor line 2 so as to allow a signal with a predetermined communication wavelength to pass therethrough, while blocking signals with frequency components of lighting surge and the like, and in which a ground line is further provided in the central conductor line and a quarter wavelength short circuit for the wavelength used is disposed in each of the ground line and the external conductor line so as to block the signal with the predetermined communication wavelength, while allowing the signals with the frequency components of lighting surge and the like to pass therethrough for grounding.
  • the quarter wavelength open circuit for the wavelength used is constructed by interposing an insulator with a length one fourth of the wavelength used, into each of the central conductor line and the external conductor line.
  • the quarter wavelength open circuit for the wavelength used is constructed by dividing each of the central conductor line and the external conductor line into pieces and interposing an insulator between the pieces of each of the central conductor line and the external conductor line.
  • FIG. 1 is a vertical sectional view of a communication line surge protecting system as an embodiment of the present invention.
  • the central conductor line 1 is a central conductor line of a communication line.
  • the central conductor line 1 is composed of a cylindrical first divided central conductor line 1 a , a second central conductor line 1 b arranged concentrically with the first divided central conductor line 1 a and having a cylindrical portion 1 b 1 at a tip portion thereof, and a third central conductor line 1 c screwed in a through-hole 1 b 2 drilled in the second central conductor line 1 b , the third central conductor line 1 c extending perpendicularly to the first divided central conductor line 1 a and the second central conductor line 1 b.
  • the external conductor line 2 is an external conductor line of the communication line.
  • the external conductor line 2 has a cylindrical first divided external conductor line 2 a , a cylindrical second divided external conductor line 2 b having a smaller diameter than the first divided external conductor line 2 a , a cylindrical third divided external-conductor line 2 c , and a cylindrical fourth divided external conductor line 2 d .
  • the first divided external conductor line 2 a , the second divided external conductor line 2 b , the third divided external conductor line 2 c , and the fourth divided external conductor line 2 d are concentrically arranged.
  • the external conductor line 2 has a fifth divided external conductor line 2 e screwed in a through-hole 2 c 1 drilled in a circumferential wall of the third divided external conductor line 2 c , the fifth divided external conductor line 2 e extending at right angles to the first divided external conductor line 2 a , the second divided external conductor line 2 b , the third divided external conductor line 2 c , and the fourth divided external conductor line 2 d.
  • an end of the third divided external conductor line 2 c is screwed in an end of the fourth divided external conductor line 2 d at a screwed portion s 1 .
  • An end of the second divided external conductor line 2 b is screwed in the other end of the third divided external conductor line 2 c at a screwed portion s 2 .
  • the central insulator 3 is a central insulator composed of a dielectric or the like.
  • the central insulator 3 has a cylinder 3 b having a side wall 3 a at one end thereof, and a flange portion 3 d formed at an opening 3 c in the cylinder 3 b.
  • the cylindrical first divided central conductor line 1 a of the central conductor line 1 is inserted into the cylinder 3 b of the central insulator 3 so that an end surface of the first divided central conductor line 1 a abuts against the side wall 3 a of the central insulator 3 . Further, the cylinder 3 b of the central insulator 3 is configured to be fitted into the cylindrical portion 1 b 1 of the second central conductor line 1 b , which constitutes the central conductor line 1 .
  • the external insulator 4 is an external insulator composed of a dielectric or the like.
  • the external insulator 4 has a cylinder 4 b formed at one end thereof and having a side wall 4 a with a through-hole 4 a 1 drilled therein, and a larger diameter portion 4 d formed near an opening 4 c formed at the other end of the cylinder 4 b , the large diameter portion 4 d having a larger outer diameter than the cylinder 4 b.
  • the cylindrical first divided external conductor line 2 a of the external conductor line 2 and the external conductor 4 are joined together at a screwed portion s 3 composed of a threaded portion formed on an inner circumferential surface of the cylindrical first divided external conductor line 2 a , which constitutes the external conductor line 2 , and a threaded portion formed on an outer circumferential surface of the cylinder 4 b of the external insulator 4 . Further, the cylindrical second divided external conductor line 2 b of the external conductor line 2 is fitted into the cylinder 4 b of the external insulator 4 .
  • the larger diameter portion 4 d of the external insulator 4 is configured to lie beyond an outer circumferential surface of the first divided external conductor line 2 a , which constitutes the external conductor line 2 .
  • the flange portion 3 d of the central insulator 3 is installed so as to fit into a through-hole 4 a 1 drilled in the side wall 4 a of the external insulator 4 .
  • 5 a is a ring-like insulating support member arranged between the first divided central conductor line 1 a , which constitutes the central conductor line 1 , and the first divided external conductor line 2 a , which constitutes the external conductor line 2 .
  • 5 b and 5 c are ring-like insulating support members arranged between the second central conductor line 1 b , which constitutes the central conductor line 1 , and the third divided external conductor line 2 c , which constitutes the external conductor line 2 , the ring-like insulating support members 5 b , 5 c being also arranged across the third central conductor line 1 c , which constitutes the central conductor line 1 .
  • An insulator 6 composed of a dielectric or the like is arranged between the third central conductor line 1 c , which constitutes the central conductor line 1 , and the fifth divided external conductor line 2 e , which constitutes the external conductor line 2 .
  • An upper end portion 1 c 1 of the third central conductor line 1 c which constitutes the central conductor line 1 , is inserted into a through-hole drilled in a ceiling portion 2 e 1 formed near an upper opening in the fifth divided external conductor line 2 e , which constitutes the external conductor line 2 .
  • a nut 7 is screwed in a threaded portion formed at the upper end portion 1 c 1 of the third central conductor line 1 c . Then, the third central conductor line 1 c , which constitutes the central conductor line 1 , and the fifth divided external conductor line 2 e , which constitutes the external conductor line 2 , are connected together to constitute a grounding portion 8 .
  • the central conductor line 1 is provided with the third central conductor line 1 c , which grounds the central conductor line 1 .
  • the fifth divided external conductor line 2 e which constitutes the external conductor line 2 so as to surround the third central conductor line 1 c , is provided so as to branch from the third divided external conductor line 2 c .
  • the third central conductor line 1 c and the fifth divided external conductor line 2 e are electrically connected together via the grounding portion 8 .
  • 10 , 11 are joining portions that connect the central conductor line 1 and external conductor line 2 to other external conductor lines.
  • the joining portions 10 , 11 are connected to the other external conductor lines using appropriate mounting flanges 12 , 12 . 13 is an air portion formed between the second divided external conductor line 2 b , which constitutes the external conductor line 2 , and the second central conductor line 1 b , which constitutes the central conductor line 1 .
  • the insulator length of the central insulator 3 sandwiched between the first divided central conductor line 1 a and second central conductor line 1 b , which constitute the central conductor line 1 , and the insulator length of the external insulator 4 sandwiched between the first divided external conductor line 2 a and second divided external conductor line 2 b , which constitute the external conductor line 2 , are each set to one fourth of a wavelength used.
  • the quarter wavelength open circuit for the wavelength used ( ⁇ ) has an insulating structure in which part of the communication line is blocked.
  • the length of the insulator, i.e. an open line length (La) is determined as follows:
  • the input impedance (Zin) of the quarter wavelength open circuit is given by:
  • La open line length (length of the insulator)
  • the quarter wavelength open circuit exhibits a high impedence, i.e. a very marked insulating characteristic for signals other than one with the predetermined frequency f, i.e. signals other than the frequency signal which correspond to lighting surge and the like. Accordingly, the quarter wavelength open circuit hinders the passage of signals other than the signal with the predetermined frequency (f). That is, the grounding portion 8 of the quarter wavelength open circuit discharges lighting surge and the like, i.e. signals with frequencies other than the predetermined frequency f, to the ground.
  • a communication circuit has a signal frequency (f) of 3 gigaherzs (GHz)
  • the wavelength ( ⁇ ) corresponding to this signal frequency is 10 centimeters (cm) as shown in the equation below.
  • the insulator of the quarter wavelength open circuit is 2.5 cm long.
  • a signal with a communication frequency of 3 GHz passes through the quarter wavelength open circuit without any losses.
  • the input impedance (Zin) of the quarter wavelength short circuit is given by:
  • Lb short circuit line length
  • the quarter wavelength short circuit exhibits, for the signal frequency (f), an input impedance corresponding to infinite resistance, thereby hindering the passage of the signal frequency (f).
  • the quarter wavelength short circuit exhibits a low impedance for signals for lighting surge and the like, which have frequencies different from the signal frequency (f).
  • the signals with these frequency components pass through the circuit, i.e. flow from the central conductor line 1 via the grounding portion 8 to the ground.
  • the quarter wavelength open circuit has an insulating structure in which the communication line is blocked.
  • the insulation distance to be protected from lighting surge and the like varies with the magnitude of current, temperature, and humidity.
  • an impulse withstand voltage of about 100 volts (V) has only to be assumed, and dielectric breakdown can be avoided. Consequently, a spatial distance of 0.5 millimeters (mm) has only to be ensured, and a surface distance of about 1 mm has only to be ensured for a printed circuit board or the like.
  • Negative lighting surge and the like flow from the ground through the external conductor line and connection equipment into the central conductor line.
  • the quarter wavelength open circuit with a length one fourth of the wavelength used by the external conductor line exhibits a high impedance to prevent lighting surge and the like from invading into the connection equipment.
  • a signal of a predetermined wavelength used passes through a communication line and is insulated from the ground.
  • signals for lighting surge and the like which have frequencies different from the predetermined one are hindered from passing through the communication line and are connected to the ground, to which the lighting surge is discharged. Therefore, connection equipment can be safely and reliably protected from lighting surge to obtain a good and reliable communication signal with few losses.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Details Of Aerials (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
US10/226,313 2001-09-06 2002-08-23 Communication line surge protecting system Expired - Lifetime US6791813B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001-269874 2001-09-06
JP2001269874A JP3619796B2 (ja) 2001-09-06 2001-09-06 通信線路サージ保護システム

Publications (2)

Publication Number Publication Date
US20030043524A1 US20030043524A1 (en) 2003-03-06
US6791813B2 true US6791813B2 (en) 2004-09-14

Family

ID=19095615

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/226,313 Expired - Lifetime US6791813B2 (en) 2001-09-06 2002-08-23 Communication line surge protecting system

Country Status (5)

Country Link
US (1) US6791813B2 (ja)
JP (1) JP3619796B2 (ja)
CN (1) CN1286238C (ja)
DE (1) DE10241431B4 (ja)
HK (1) HK1054626A1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080247113A1 (en) * 2007-03-14 2008-10-09 Panduit Corp. Protection patch panel
US20090251840A1 (en) * 2008-04-08 2009-10-08 John Mezzalingua Associates, Inc. Quarter wave stub surge suppressor with coupled pins

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6926555B2 (en) * 2003-10-09 2005-08-09 Radio Frequency Systems, Inc. Tuned radio frequency coaxial connector
CN101771241B (zh) * 2008-11-06 2012-08-29 长沙普天天籁防雷科技有限公司 一种保护光端机免遭雷电及电涌脉冲破坏的方法及装置
DE102009007622B4 (de) * 2009-02-05 2011-04-21 Spinner Gmbh Koaxialer Überspannungsableiter
US8125752B2 (en) * 2009-04-17 2012-02-28 John Mezzalingua Associates, Inc. Coaxial broadband surge protector
JP5494927B2 (ja) * 2009-08-03 2014-05-21 株式会社リコー カメラユニット及びセンシング装置
CN104577271A (zh) * 2013-10-22 2015-04-29 芯迪半导体科技（上海）有限公司 一种浪涌保护电路
KR102633260B1 (ko) * 2023-01-18 2024-02-05 주식회사 유니컨 통신 선로 및 커넥터

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4985800A (en) * 1989-10-30 1991-01-15 Feldman Nathan W Lighting protection apparatus for RF equipment and the like
US5844766A (en) * 1997-09-09 1998-12-01 Forem S.R.L. Lightning supression system for tower mounted antenna systems
US6636407B1 (en) * 2000-09-13 2003-10-21 Andrew Corporation Broadband surge protector for RF/DC carrying conductor

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777219A (en) * 1972-08-14 1973-12-04 Gen Semiconductor Ind Inc Electromagnetic pulse suppressor
US3863111A (en) * 1973-06-29 1975-01-28 Gen Electric Polycrystalline varistor surge protective device for high frequency applications
JPS58225586A (ja) * 1982-06-23 1983-12-27 ヒロセ電機株式会社 同軸型避雷構造
US4467390A (en) * 1982-08-06 1984-08-21 Carpenter Jr Roy B Lightning protector and filter
ES2180079T3 (es) * 1997-01-27 2003-02-01 Huber+Suhner Ag Derivacion de emp.
AU740311B2 (en) * 1998-02-17 2001-11-01 Huber & Suhner Ag EMP - charge eliminator
JPH11251807A (ja) * 1998-02-27 1999-09-17 Idotai Tsushin Sentan Gijutsu Kenkyusho:Kk 容量結合装置
ES2232053T3 (es) * 1998-08-06 2005-05-16 Spinner Gmbh Elektrotechnische Fabrik Descargador de sobretension coaxial de banda ancha.
JP3392367B2 (ja) * 1999-03-12 2003-03-31 株式会社デンソー 非接触型高周波伝達装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4985800A (en) * 1989-10-30 1991-01-15 Feldman Nathan W Lighting protection apparatus for RF equipment and the like
US5844766A (en) * 1997-09-09 1998-12-01 Forem S.R.L. Lightning supression system for tower mounted antenna systems
US6636407B1 (en) * 2000-09-13 2003-10-21 Andrew Corporation Broadband surge protector for RF/DC carrying conductor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080247113A1 (en) * 2007-03-14 2008-10-09 Panduit Corp. Protection patch panel
US7869179B2 (en) 2007-03-14 2011-01-11 Panduit Corp. Protection patch panel
US20090251840A1 (en) * 2008-04-08 2009-10-08 John Mezzalingua Associates, Inc. Quarter wave stub surge suppressor with coupled pins
US8134818B2 (en) 2008-04-08 2012-03-13 John Mezzalingua Associates, Inc. Quarter wave stub surge suppressor with coupled pins

Also Published As

Publication number Publication date
JP3619796B2 (ja) 2005-02-16
HK1054626A1 (en) 2003-12-05
US20030043524A1 (en) 2003-03-06
DE10241431B4 (de) 2012-12-27
CN1407680A (zh) 2003-04-02
CN1286238C (zh) 2006-11-22
JP2003087036A (ja) 2003-03-20
DE10241431A1 (de) 2003-03-27

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